Saw-filing machine.



No. 867,512; l PTENTED 00T. 1, 1907. L. s. KEBTBR. l

' SAW yFILING MACHINE.

ArPLroATIoN FILED 23.11.1906.

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PATENT OFFlCE.

LOGAN S. KEETER, OF SALISBURY, NORTH GAROLlNA.

SAW-FILING MACHINE To all whom it may concern:

Be it known that I, LOGAN S. KEMER, a citizen of the United States, residing at Salisbury, in the county of Rowan and State of North Carolina, have invented a new and useful SawFiling Machine, of which the following is a specification.

This invention relates to saw filing and setting machines, and has for one of its objects to provide a machine in which the saw is operated upon in opposite directions simultaneously in order to equalize strains, two files being used which simultaneously engage separate teeth, and while one is on the out stroke, the other is on the in stroke.

A further object of the invention is to construct a machine of this type in which the file carriers may be arranged to reciprocate a number of times, and then move upward to disengage the files from the teeth of the saw prior to a saw feeding movement.

A still further object of the invention is to provide a mechanism of simple construction for quickly adjusting the pressure on the file in accordance with the condition ofthe file and saw.

A still further object of the invention is to provide a novel form of saw feeding mechanism which may be adjusted for the purpose of feeding saws having teeth of any pitch.Y

With these and other objects in view, as will more.

fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawingsz-Figure 1 is a plan view of a saw filing and setting machine constructed in accordance with the invention. Fig. 2 is a vertical section of the same on the line 2-2 of Fig. 1. Fig. 3 is a similar view on the fine 3-3 of Fig. 1. Fig. 4 is a detail perspective view of the saw feeding mechanism, detached Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The Working parts of the machine are supported on a suitable frame 10 that is provided with bearings for the support of a pair of shafts 11 and l2, disposed in parallel relation, the shaft 11 being connected to any suitable operating mechanism, this in the present instance being shown in the form of a crank 13.

The shaft 11 carries a gear wheel 14 that intermeshes with a pinion 15 on the shaft 12, the relative diameters of the gear and pinion being such that there Will be four file strokes in the sharpening of each tooth, but

Specification of Letters Patent. i

Application led April 11,

Patented Oct. 1, 1907.

1906. Serial No. 311,153.

, the gears may be made larger or smaller for the purpose of increasing or decreasing the number of sharpening strokes.

The frame carries two guides 1 7 and 18 arranged at an acute angle with reference to eachother, and each of them being at an angle with respect to the transverse plaire of the saw being sharpened. Arranged in these guides are file carrying arms 19 and 20, respectively, and these are connected at their rear ends to a rocker arm 2l, that is centrally pivoted on a vertical stud 22 carried by the frame. rlhe rocker arm is provided with a rearwardly extending arm 23 carrying a pin or autifriction roller 24 that enters a cam groove formed in a collar 26 that is rigidly secured to the shaft 12, and as said shaft is rotated, the rocker bar is oscillated and the le carrying arms 19 and 2() are operated, simultaneously, but in opposite directions, respectively. The outer end of each file carrying arm is arranged for the support of an ordinary form of file w, the point of the file being inserted in a suitable socket 27, while the tang is engaged byY an adjustable screw 28 that is carried by a lug 29 at the end of the arm.

At a point near the front of the frame is a cam shaft 30 carrying a cam 31 that extends under both of the file carrying arms. At one end of the shaft is secured a rocker arm 32 that is connected by a rod 33 to a crank 34 at the end ofthe shaft 12. The cam is so arranged on shaft 30 that during the idle strokes of the file, the file carrying arms will be elevated, one arm being elovated while making the stroke in one direction, and the other being elevated while making the stroke in the opposite direction, and during the active stroke the file carrying arms are allowed to..descend, and in addition are forced downward so that the files may properly engage the saw, leaf springs 3G being employed for this purpose. The leaf springs 3G are .carried by a transversely disposed rock shaft 37 that is mounted in suitable brackets 38 supported by the frame, and at one end of said rock shaft 37 is a rocker arm 40 that is connected by a link 41 to a rocker arm 42at the end of the crank shaft 30. These parts are so arranged that during the active stroke, the springs are forced down into engagement with the upper surface of the file carriers, but during the idle stroke the rock shaft 37 is turned in order to relieve pressure on the file carrying arms as the latter are elevated. ln order to adjust the stress of the springs, the rocker arm 40 is connected to the rock shaft 37 by means of a thumb screw/f8, and by loosening the screw and turning the shaft, the stress of the spring may be increased to any desired extent. The screw may then be turned in order to lock the shaft in adjusted position.

At the front of the frame is arranged a pair of guide strips 50 and 51 that are provided with oppositely disposed grooves for the reception of a slidable bar 52 that carries a number of vertically disposed arms 53, and at the upper ends of these arms are saw clamping strips 54 which are preierably secured together at their opposite ends at points beyond the ends ol the saw. The central portion of the clamp may then be forced tightly against the saw by means of a screw 58 passing through one of the arms 53. The clamp is oi such construction as to accommodate any of the commerical forms of hand or meat saws, although, of course, it may be modified lor the purpose oi tiling saws ol any type.

To the inner face oi the bar 50 are secured brackets G0 that serve as supports lor a revolubly adjustable rack (il. This rack is in the iorm oi a many sided bar that is provided with sets ol rack teeth 62 ol different pitch, any one ol which may be adjusted to operative position in accordance with the pitch ofthe teeth of the saw being sharpened.

The teeth ol' the rack in operative position are engaged by a spring pressed pawl 65 that is carried at one end or' a lever' GG pivoted on a stud G7 that is carried by a. portion ol the trame. The opposite end ol the lever is engaged by a cam GS on a disk (S9 that is supported by the shalt ll, and said lever is held in engagement., or in operative relation to the cam by means ol a small spring 70.

The lecding movement ol the pawl carrying lever is limited by an adjustable stop block 7l that is supported by the lrame and is provided with a locking screw 72 that is arranged to extend through a suitable slot in the lralne lor the purpose ol permitting ready adjustment ol' the block, and the position of said block may be determined by gage marks 73 that are lornied in the trame.

lt will be seen that while the cam GS moves the lever GG outward to the same position at each operation, the extent ol' inward movement ol the lever is controlled by the stop block 7l, and the stroke oi the lever' may thus be adjusted in accordance with the pitch ol the rack with which the leeding pawl is in engagement, so that the operator, knowing the pitch of the saw teeth, may readily adjust the rack ol corresponding pitch to operative position and then adjust the gage block 7l to a corresponding extent.

The setting el the saw teeth is accomplished by a pair ol' dies 80 and 8l that are arranged to engage adjacent the teeth and set the same in opposite directions, respectively. These setting dies are supported by blocks 82 that are adjustable in slots 83 ormed in a pair ol levers 84H35. The adjustment oi the carrying blocks is, ol course, determined by the pitch of the saw teeth, and when once adjusted the blocks may be positively locked by nuts 8G.

Extending l'rom one oi the side members ol the irame is a bracket S8 that carries a vertically disposed stud 89 on which is pivoted a level' 90, and said lever is provided with two alining slots 9i i'or the reception ol pins or anti-lriction rollers 92 that are carried by the levers 84-85- his bar is connected at One end to a rod 94 that is carried by an eccentric strap 95 embracing an eccentric 9G. The eccentric is arranged at the upper end oi a shalt 97 that is vertically stepped in the irame, and said shait 97 carries a rocker arm 9S that is connected to one end of a slidably mounted bar 99 that is held at one end of a. suitable guide block ltltl supported by the frame. The bar Slt) provided with a pair ol' spaced depending lingers ltll which are engaged by a. crank pin Ai013 that projects from the disk titl. and as the disk rotates, the bar 99 will be moved in the direction ol its length, and this movement. will be. transmitted through the mechanism described to the, lever 90, causing the latter' to turn on its pivot 89 and the walls of the slots il] then acting as cams on the pins or anti-friction rollers 92, and causing the levers Sl and S5 to move toward or from each other. 'l`hc levers are pivotally connected by a vertical stud ltlil that is carried by the frame at a point immediately above the saw clamps. so that the dies will be held in position tor proper movement, and as said dies simultaneously operate in. opposite directions, respectively. the stress on the saw and on the operating mechanism will be equalixed.

With a device constructed in. accordam'e willi this invention, saws may be rapidly set and sharpened without the exercise ol" any special skill on the part ol` the workman, and the machine may be readily adjusted in order to accommodate saws ol dit'lerent sixe and having teeth oi different pitch.

l claim 1. ln a machine of the class described, u frame, a saw support, a pair of reciproctttory tile carriers uri-:urged :it an angle to cach other, a rocker har tio which said carriers are connected, a driven sllatft', :i cam carried thereby, and connected lo the rocker bar to simultaneously impart, movement tio the carriers in opposite directions, respectively, :1 cum shaft?, an elongated cam carried thereby :1nd extending' under both ot' the tile carriers, a rocker arm on said cam shaft', and means for connecting' said rocker arm tio the driven shaft to time the movement ot' the caln with relation to the movementl of the tile carriers.

2. ln u machine of the class des ibed, the combination with a saw support, of a pair of tile carriers. means for reciprocating said tile carriers, means for elevating' the lill` carriers to hold the tiles from engagement with the saw during the idle or return stroke, pressure springs acting on such carriers, means for supporting said pressure springs, and means for moving the spring supports to relieve the pressure on the tile carriers during such idle stroke.

li. ln a machine ol the class described, the combination with a saw support, of a pair of tile carriers, means 1`or reciprocatingl the same, a cam sha cams carried by the shaft and arranged to move the carriers to elevated position during the idle stroke, a rock shaft'. springs carried thereby and bearing on the tile carrier, aud menus for turning said shaft to relieve the spring pressure t'luringl the idle stroke.

l. ln mechanism of the class described, the combination with a saw support', ot` a pair of reciprecatory tile carriers. a rocker bar to which one end of cach carrier is connected. means for actuating said rocker bar, a cam shaft, u cum carried by the shaft and arranged to elevate said tile earriers, a rock shaft, springs carried by the rock shaft and bearing on the carrier, a rocker arm extending from the rock shaft, a second rocker arm carried by the com shaft, a link connecting the two rocker arms, and means for imparting movement to the cam shaft.

ln testimony that l claim the foregoing :1s nl v own, l have hereto atlixed my signature in the presence of two witnesses.

Witnesses D. Z. Wm'rn, C. .T. Kus'rnnn.

llO 

